Generate a long pulse with a different source clock

I have configured the 6601 to generate a 1khz train on Ctr0
I would like to feed this into the source of Ctr1 to generate pulses of longer duration.
I use the command DaqmxCreateCOPulseChanTicks to set up my pulse train on Ctr1.
It works if I leave the source terminal as Null "", but it does not work if I change the source.
To change the source, I have wired ctr0 output to the source of ctr1 and use the label "dev1/PFI39" as the source terminal and have tried "dev1/ctr0Output".
I am using Visual Basic 6.
What am I missing?

Hi,
Are you receiving any errors when you use anything except null as your source or is the counter simply not outputting anything? Also, have you tried using "Dev1/ctr0internaloutput" as a source as well?
Regards,
Hal L.

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How can I specify a delay generate a counter pulse?

Hi all,
I have a question about using the counter to generate the pulse train. I don't have how to program it but I try the test panel in the MAX and I see it generates the pulse train at some rate and with some pulse duration. I am thinking if it is possible to generate only one pulse with given pulse duration at sometimes after I start the task? I have a code to output an analog waveform, the waveform lasting for 35ms. I wonder if it is possible to syncronize the output of the analog waveform as well as the counter such that at 12.5ms after the waveform output started, I send that single pulse from the counter port out. I have no idea how to do that, I am thinking to use a delay but it is hard to precisely control the time to exact 12.5ms.
Solved!
Go to Solution.

PKIM wrote:
Hi all,
I have a question about using the counter to generate the pulse train. I don't have how to program it but I try the test panel in the MAX and I see it generates the pulse train at some rate and with some pulse duration. I am thinking if it is possible to generate only one pulse with given pulse duration at sometimes after I start the task? I have a code to output an analog waveform, the waveform lasting for 35ms. I wonder if it is possible to syncronize the output of the analog waveform as well as the counter such that at 12.5ms after the waveform output started, I send that single pulse from the counter port out. I have no idea how to do that, I am thinking to use a delay but it is hard to precisely control the time to exact 12.5ms.
I found an example in the CVI show how to generate a single digital pulse
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I have two questions. First of all, to create a pulse, does it mean we have low state for sometimes, then high state for some times and then low state again? So why there is only two time parameters (lowtime and hightime)? Is the minimum lowtime and hightime depending on the sampling rate of the card or depending on the OS? I am using 6711 card
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I need to generate a sequence of pulse trains with DAQmx (the card I have is a PXI-6229 card). As an example:
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If I use the CreateVirtualChannel.vi in "CO pulse ticks" mode, I can only specificy offset, high ticks and low ticks, but not that the sequence of pulses should be repeated after some time.
Now I thought that I could solve this problem if it were possible to multiply two counter outputs: the first counter would generate the pulses (continuously) whereas the second one would switch between low and high on a slower timescale in order to gate the first counter, thereby providing an initial offset and the "off" phases between the pulse trains.
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Hi dlanger,
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Retrigger and Repeat Finite Digital Pulse Train in LabVIEW
http://decibel.ni.com/content/docs/DOC-8473
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Generating More Than 2 Pulse Trains Using CompactDAQ
http://decibel.ni.com/content/docs/DOC-2167
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Attachments:
Gen Gated Dig Pulse Train-Continuous.vi ‏38 KB

Generate a long pulse with a different source clock

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